Backplate for use with a scuba tank



FIG. 1 is a plan view of a backplate for use with a scuba tank, showing mynew design;

FIG. 2 is a right side view thereof, the left side being a mirror image thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a rear view thereof; and,

FIG. 5 is a top view thereof. 

The ornamental design for a backplate for use with scuba tank, as shown and described. 